An investor who invested N6,500/00 at some simple interest rate collected a total amount of \(\mathrm{N} 7,800.00\) after four years. How much simple interest would he have collected after two years if he had invested \(N 9,000,00\) ?

A. N1,000.00
B. \(\mathrm{N} 10,000,00\)
C. \(N 5,400,00\)  
D. \(19900.00\)

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Correct Answer: C